Abstract
Employing the relativized quark model and the quark-interchange model, we investigate the decay of the charged heavy quarkonium-like states Z_c(3900), Z_c(4020), Z_c(4430), Z_b(10610) and Z_b(10650) into the ground and radially excited heavy quarkonia via emitting a pion meson. The Z_c and Z_b states are assumed to be hadronic molecules composed of open-flavor heavy mesons. The calculated decay ratios can be compared with the experimental data, which are useful in judging whether the molecule state assignment for the corresponding Z_c or Z_b state is reasonable or not. The theoretical framework constructed in this work will be helpful in revealing the underlying structures of some exotic hadrons.
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